I think the op reversed his words and forgot to use a question mark. Can anyone tell the ....?

For most GTs, especially 90s metal ones, it is just a way to identify the brand. It's practically their logo.

The relatively recent GT Grade gravel bikes in carbon might actually be different. The seatstays are not bonded to the seat tube, just the top tube connection point. They claim this allows float and acts like a passive suspension. Not much but enough to give a comfy ride. I don't know if their claims are true or if the engineered flex is greater with their design.